%0 Journal Article %A EZIZ Mamattursun %A MAMUT Ajigul %A MOHAMMAD Anwar %A Guofei MA %T Assessment of heavy metal pollution and its potential ecological risks of farmland soils of oasis in Bosten Lake Basin %D 2017 %R 10.11821/dlxb201709012 %J Acta Geographica Sinica %P 1680-1694 %V 72 %N 9 %X

A total of 195 soil samples of farmland were collected from oasis in the Bosten Lake Basin, Xinjiang, and the concentrations of eight heavy metal elements (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were identified by standard methods. The spatial distribution of soil heavy metals in farmland was analyzed based on geostatistical analysis, while the pollution load index (PLI) and potential ecological risk index (RI) were employed to the assessment of the soil heavy metal pollution levels and potential ecological risk. Then the main sources of heavy metals were discussed. Results showed that: (1) The average value of the contents of Cd, Cr, Cu, Ni, Pb and Zn exceeded by 1.67, 1.13, 1.15, 1.29, 2.11 and 1.65 times of the soil background value of Xinjiang, respectively. (2) The spatial distribution of eight heavy metals showed an island-like pattern, and all the heavy metal elements showed high value areas in some parts of the study area, indicating the negative effects of human activities on soil environment of farmlands. (3) Pb presented a moderate pollution, whereas Cd, Zn, Ni, Cu and Cr a light pollution, Mn a slight pollution and As no pollution for farmland soils. The average PLI value of the heavy metals was 1.09, which showed a slight pollution. (4) The average E value for each heavy metal element was ranked as: Cd > Ni > As > Cu > Pb > Cr > Zn. The average RI value was 18.63, which showed a slight ecological risk situation. In terms of regional differences, the ecological risk index was ranked as: Hoshut County > Baghrash County > Karashahar County > Hejing County. (5) Cr, Cu, Mn, Ni and Zn contents were controlled mainly by the soil geochemical genesis and As, Cd and Pb were mainly affected by human activities. Cd and Pb were the main pollution sources of farmland soils, which should be given more attention.

%U https://www.geog.com.cn/EN/10.11821/dlxb201709012